ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2021 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Accrual for Environmental Loss Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of environmental liabilities, current and non-current |
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Schedule of changes to environmental remediation liabilities | Changes in the reserves for environmental remediation liabilities during first six months 2021 and full year 2020 are summarized below:
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